One of the first ornamental fish in the hobby (pre-dating the Goldfish in Europe). Paradise Fish are stunning, hardy, subtropical Anabantoids. However, they are notoriously aggressive, often exceeding the aggression of Bettas. They are cold-tolerant and thrive in unheated indoor aquariums, but they will readily attack smaller tank mates, eat fry, and fight conspecifics to the death.
At a Glance
Tank Requirements
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Water Parameters
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Temperament & Compatibility
Available Varieties
Each variety inherits the species defaults above. Only differences are highlighted.
Male (Standard / Color Morphs)
The standard male form. Features long, flowing filaments on the forked tail and dorsal fin. Extremely territorial and aggressive. Must be kept singly. Will kill small fish (Neon Tetras, Guppies) and fight other anabantoids.
Differs in 3 traits from base species
Also known as: Blue, Red, Albino, Black, Super Red
Female
Smaller, duller color, and shorter fins (lacking long filaments). While less aggressive than males, they are still 'nasty' compared to other Gouramis and will nip fins. Can be kept in groups if the tank is large and heavily planted.
Differs in 4 traits from base species
Paradise Fish Care Guide Summary
The Paradise Fish, scientifically known as Macropodus opercularis, belongs to the Anabantoids family group. Adults reach a maximum size of approximately 10 cm and have a compressed body shape with a moderate growth rate. Classified as aggressive, this species primarily occupies the surface and mid-level zones of the aquarium and produces a medium level of biological waste.
To thrive, the Paradise Fish requires a freshwater only aquarium with a minimum volume of 75 litres and a tank length of at least 80 cm. Water temperature should be maintained between 16°C and 26°C, with a pH range of 6–8 and a general hardness of 5–30 dGH. A low water flow is preferred. An aquarium test kit can help you monitor these values.
Due to its specialist needs, the Paradise Fish is best suited for fishkeepers who can provide a carefully planned setup. This species is available in 2 varieties: Male (Standard / Color Morphs) and Female. Each may differ slightly in size, temperament, or care needs, so it is worth checking the specific requirements of the variety you plan to keep.
Paradise Fish Habitat Setup
When setting up an aquarium for the Paradise Fish, a low water flow best suits their natural preferences. Because this species occupies the surface and mid-level zones, the aquarium layout should prioritise adequate surface area with floating cover to make them feel secure near the waterline and open swimming space in the centre of the tank for free movement. Useful additions include dense planting to provide cover, break sightlines, and reduce stress and floating plants to diffuse overhead light and create shaded areas. Keepers should note that a tight-fitting lid is essential, as this species is a known jumper.
Paradise Fish Compatibility Notes
Classified as aggressive, the Paradise Fish is best housed alone, as they do not tolerate others of their kind in confined spaces. When choosing tankmates, avoid housing with slow-moving or long-finned species that may become targets for fin nipping, conspecific aggression can be intense, especially in smaller tanks, territorial behaviour may cause issues if hiding spots or floor space are limited, and their energetic swimming style may stress more sedentary or timid species. Selecting tankmates that favour different water layers from the surface and mid-level zones can help reduce competition and territorial overlap.
Recommended Tank Sizes
Standard aquarium sizes that meet the minimum volume and length requirements for Paradise Fish.
30 Gallon Breeder
40 Gallon Breeder
55 Gallon Standard
60 Gallon Breeder
75 Gallon Standard
90 Gallon Standard
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Frequently Asked Questions About Paradise Fish
How big does Paradise Fish get?
Paradise Fish (Macropodus opercularis) typically reaches a maximum adult size of approximately 10 cm. They have a compressed body shape and a moderate growth rate.
What tank size does Paradise Fish need?
A minimum aquarium volume of 75 litres and a tank length of at least 80 cm are recommended for Paradise Fish. This ensures enough swimming space and helps maintain stable water conditions.
What water parameters does Paradise Fish need?
Paradise Fish thrives in freshwater only conditions with a temperature range of 16–26°C, a pH between 6 and 8, and a general hardness of 5–30 dGH. A low water flow is preferred.
Is Paradise Fish peaceful or aggressive?
Paradise Fish is classified as aggressive with an aggression score of 8 out of 10. Careful tankmate selection is essential to avoid conflict.
Can Paradise Fish live with others of its kind?
No. Only one Paradise Fish should be kept per tank. Keeping multiples in the same aquarium typically results in aggression and stress.
Does Paradise Fish have any special tank requirements?
Yes. Paradise Fish benefits from plants - densely covered and plants - floating in the aquarium. These features help replicate their natural habitat and promote overall health and well-being.
Does Paradise Fish need a lid on the tank?
Yes. Paradise Fish is a known jumper, and a tight-fitting lid or cover is essential to prevent escape. Even a small gap can be enough for a determined fish to leap out.
Similar Species
Goldfish (Comet / Common)
Carassius auratus
One of the most commonly kept and misunderstood fish in the hobby. Single-tailed goldfish (Comets, Commons, Shubunkins) are fast-growing, highly active coldwater fish that produce enormous amounts of waste. They are best suited for ponds or massive aquariums. They will uproot plants, sift substrate constantly, and eat anything that fits in their mouths.
Betta (Siamese Fighting Fish)
Betta splendens
The Siamese Fighting Fish is an aquarium icon known for its labyrinth organ (allowing air breathing) and vivid colors. While hardy, they require heated, filtered water (24-30°C). Males are solitary and fiercely territorial. Females are generally less ornate but can be kept in 'sororities' with strict precautions (minimum 5 females in 75L+).
Guppy
Poecilia reticulata
One of the most iconic and widely kept aquarium fish. Renowned for their incredible colors, hardiness, and prolific breeding. As livebearers, they give birth to fully formed, free-swimming fry. Males constantly pursue females for mating; therefore, a ratio of at least 2 females per male is strongly recommended to disperse stress.
Peppered Corydoras
Corydoras paleatus
One of the most popular and hardy Corydoras species. Notably, they prefer cooler water temperatures than most tropical fish. They are peaceful, bottom-dwelling schooling fish that use their sensitive barbels to sift through the substrate for food. They must be kept in groups to thrive.
Rosy Barb
Pethia conchonius
A hardy, active, and colorful subtropical schooling fish. Known for the male's striking rosy-red breeding dress, while females are more golden/silver. They are voracious eaters, very active swimmers, and can be fin-nippers if kept in too small a group. Best kept in cooler water compared to tropical species. The Long Finned morph is also popular but requires gentler flow.
Cherry Shrimp
Neocaridina davidi
One of the most popular and hardy freshwater invertebrates in the hobby. They come in a rainbow of selectively bred colors. They are excellent scavengers and algae eaters, perfect for nano planted tanks. They are completely peaceful and have a negligible bioload, though they are highly vulnerable to predation by almost any fish with a mouth large enough to eat them.